Thin-place preventer for looms



Patented Dec. 5

Patented Dec. 5, lQZZ.

llla lll d'l' TzEfi A TET FFliCE-i ISAAC SNOW, Oil LAWRENCE, MASSACHUSETTS, ASSZGNOB Tl) DRAPER CORPORATION,

OF HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

THIN-PLACE rnnvnnrnn For. LOOMS.

Application filed September 13, 1921. Serial at. 500,323.

Thin-Place Prey/enters for Looms, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts. i

This invention relates to looms, and more particularly to thin place .preventers.

Thin places in the cloth are produced when filling fails to be laid in the she dduring the continued operation of the loom. This defective operation of the loom may be due to a variety of reasons, among which may be mentioned improper action of the filling or weft fork which may indicate the presence of filling in the shed on the beat- .up, whereas, filling had not been laid in the shed. This would occur it the grid be came clo 'ed with lint, or the tines of the filling fork became bent. It sometimes happens, also, that in filling replenishing looms the trailing end of a broken filling will extend in front of the filling or weft fork and tilt it on the beat-up, notwithstanding the lact that a full length of filling has not been laid. in the shed. @ther conditions may arise to bring about defective operation of the loom and the thin places.

in seeking to overcome the production of cloth with thin places, it has heretofore been proposed to provide a thin place preventer at the front of the loom, which enters between the warp threads, or is otherwise so positioned as to interfere with the work of the weaver, and such devices have frequently added to the complication of the loom construction.

An important feature or the present invention, therefore, consists of a thin place preventei' locatedhack of the lay and rendered eilectivc to stop the loom when filling i i-ills to be laid in the shedprior to the beatup movement of the lay. lVhile the thin place preventer of the present invention may he variously contrived, it preferably comprises a drop wire which is normally in the path of movement of a feeler that effects loom stoppage when the feeler movement is arrested in carrying this 'feature of the invention production of cloth with into ell'ect, the drop wire is, in the present instance, associated with a warp stop molion hack of the lay, and the drop wire is raised from the path of the feeler on each beat-up movement of the lay, provided fill-. ing has been laid in the shed prior to the beat-up. I

In erfecting this general purpose of the invention, advantage is taken of the fact that the warp threads extending from the warp beam'to the breast beam are given a vertical movement of more or less amplitude when the laybeats up, provided filling has been laid in the shed. This is usually due to the lay reed imparting a frontward blow to the tell of the cloth, and exerting a lengthwise tension on the warp threads at the moment of beat-up. i I

The invention will be best understood from the accompanying drawings and following description of one good practical form thereof.

In the drawings p t,

Fig. l is a perspective view of parts of the loom, showing more particularly the Warp threads, shedding mechanism or heddies, the lay, the warp stop motion and as sociated parts, other portions of the loom being omitted. for clearness of illustration;

Fig. 2 is a cross section of the warp stop motion on an enlarged scale, and showing also in this instance, one of the drop wires in its normal or stopping position;

Fig. 3 is a perspective view with parts broken away, illustrating the drop wire and one form of drop wire controller; and

Fig. 4 is a view similar to that of Fig. 3, showing amodiiied form of drop wire control means.

To give full access to the woven portion of the cloth during the weaving operation, the present thin place preventer is shown as associated with a warp stop mot-ion at the rear of the lay. ,Thus, the weaver may at all times have, unobstructed control of the woven portion of the cloth, and the warp in front of the lay reed.

Referring more particularly to Fig. 1, the breast beam 1 of theloom may be of usual character and have extending rearwardly therefrom the usual temple 2 for holding the cloth stretched widthwise. The

lay 3 has the usual, reed 4 through which the warp threads pass, and by which the filling or weft thread is moved to and beaten up at the tell of the cloth when "the filling has been laid in the shed. Back of the are the harnesses or heddles which may be of any usual and well known character for separating the warp threads in the formation of a shed through which the usual shuttle may be picked. It has not been deemed necessary in the present exploitation of the invention, to show the means for raising and lowering the warp threads other than the heddlembecause such means forms no special part of the present invention.

The warp threads a pass from the warp b am 6 over the usual whip roll 7, and as shown, they then pass to the warp stop motion, and from there through the eyes of the heddles, through the dents of the reed to the tell of the cloth at 8, where the warp threads are combined with the filling or weft threads to form the cloth Z), and are wound upon the breast beam 52.

The whip roll or supporting bar 7 is either yieldingly mounted to yield to the longitudinal tension of the warp threads at times, or it may be given a positive movement to compensate for the diilerences in a pull upon the warp threads during wezwing. In either case the mechanical means connected to the whip roll is well understood, and needs no special description here, as it forms no essential part of the present invention.

The warp stop motion as shown, comprises a series of warp drop wires 9 which, in the present instance, are arranged in two rows and guided in their up and down move ment by their warp guide bars 10 which pass through slots 11 in the warp drop wires 9. The war; threads as usual. normallv.

support the warp drop wires in their raised position, and when a warp thread breaks or becomes too slack for weavlng purposes, the

associated warp drop wire moves into the path of a i'eeier and arrests the same. In the present instance, the warp stop motion has at each side of the rows of drop wires the warp supports 12 which may be of any 01 the well known types, but as herein illustrated, they comprise two transversely extending members, one in front and one in the rear of the rows of warp drop wires. The warp drop wires themselves may be of any oi the well known types, but as herein shown, the warp drop wires 9 are provided each with an eye 13 (Fig. 2) through which. passes one of the warp threads on its way from the warp beam to the tell of the cloth.

The feeler is a normally moving element during the loom operation, and like the warp drop wires, 't may be of any of the well known types. As herein illustrated, the feeler 14 (Fig. 2) is mounted upon a. slide 15 which is given a reciprocating movement on a fixed support 16 by means of a vibrator 17 which may be pivotally connected at 18 to a link 19 pivotally attached to the filling has been laid in the shed.

slide 15 at 20. The support 16 may be convei'iiently secured to one 01' the warp sup porting members 12, as shown by Fig. 2. The vibrator l? is mounted upon the rock shaft 21, and through suitable connections 22 with an actuating means, the vibrator 17 is given an oscillatory movement, and thereby moves the ieeler in its feeling path. The teeler in the present invention, like other well known feelers, eiiects loom stoppage when its feeling movement is arrested, but since the train or mechanism for effecting this purpose is well known, and since any of the various types thereof may be employed in connection with the present inven tion, it-is not deemed necessary to further illustrate or describe it. The construction is such that should one of the warp drop wires be released by a slack or broken warp thread, it will move into the path of the teeler A and arrest it, with the result that the loom will be stopped through the usual train of mechanism.

The drop wire of the thin place preventer is shown in the present illustration of the invention, as formed of a strip of sheet metal 23 having a slot 24 through which passes one of the drop wire guides 10, the construction being such that this drop wire may be moved relatively to the support 10. The drop wire 23, in accordance with the present invention, is normally positioned to effect loom stoppage unless it is removed from its normal position when the lay beats up the filling previously laid in the shed. In the present instance, the drop wire 23 is normally positioned with its lower end portion in the path of the feeler, and unless removed from such normal position, the drop wire will arrest the feeler and effect loom stoppage.

One of the preferred means of utilizing the movement of the warp threads to remove the drop wire 23 from its normal position when the lay beats up filling previously laid'in the shed, isindieated in Fig. wherein a drop wire controller is shown as bearing upon the sheet 01? warp threads and adapted to be moved by the wa p threads when the lay heats up. provided The troller as shown in Fig". 3, comprises the arm 25 which overlies the warp threads (1/ preferably at one side of the warp sheet. The controller 25 as shown in Fig. 3, is pivotally mounted in a bracket 26 which may be conveniently secured to one of the warp supporting members 12, as by means of the set screw 27. The bracket 26 has the bifurcated portion 28 which embraces an ient way of making it, and one portion 30 extends laterally from the pivotal supporting portion 31 under the sheet of warp threads or a portion of them, and then upwardly and frontwardly as at 32, and then laterally towards the side of the sheet of warp threads, and terminates with the downwardly extending end portion Extending forwardly from the pivotal portion 31 is the arm 34, the front end 35 of which is adapted to engage the drop wire 23 and lift it when the sheet of warp threads a is moved upwardly or in a vertical direction. The end of the arm 34 may be variously contrived, but as shown it has a hooked portion 36, one member of which passes into the slot 37 of the drop wire 23, and as the arm moves upwardly, it lifts the drop wire through the shouldered or cross portion 38 thereof, all substantially as indicated in Fig. 3. i I

When filling is laid in the shed, and the lay heats up, the warp threads (1 are subjeoted to a lengthwise tension, which, in the illustrated form. of the invention, tends to straighten the sheet of warp threads between the warp roll and the tell of the cloth, and impart to the sheet of warp threads a vertical movement upwardly. This movement of the sheet of warps is imparted to the drop wire 23, and it is removed from the path of the feeler, so that the loom continues to run. Should the filling not be laid in the shed from any vcause, the warp threads will not be subjected to the lengthwise tension hereinbet'ore noted, as the lay heats up, and consequently the drop wire 23 -would remain in its initial position, or in other words, in the path of the tteeler, and would arrest the feeler and stop the loom. When the loom has been stopped, the weaver is given an opportunity to find the fault and remedy it without the production of cloth with thin places.

In Fig. 4, as hereinbefore mentioned, a slightly modified form of the invention is illustrated. In this case the drop wire 39 has the longitudinal slot 40 through which is passed one of the guide members 10, and by which the drop wire is guided in its vertical movement. The controller, however, in this case, is formed as part of the drop wire, and comprises the laterally extending arm 41, which may have a downwardly em tending end portion 42 to maintain the drop wire in its proper lateral relation with the sheet'ot warp threads. The arm or controller 41 bears upon the sheet ofwarp threads or a portion of the sheet, as indicated in Fig. 4, and in order to insure that the drop wire 39 shall be normally positioned in the path of the feeler, it is under the stress of a light spring 43 which maybe supported by a stud projecting from an adjustable bracket 44 secured by a set screw 45 feeler and remove to one of the warp sup tiortingmembers 12. The spring, as shown, is coiled around a stud projecting from the b 'aclret 44, and has an arm 47 which is extended towards the drop wire 39 and" then downwardly at 48 and inwardly at 49, and then again downwardly at 50, the part 49 or the spring arm 47 resting upon an appropriate shouldered portion 51 of the drop wire 39, the construe tion being such that normally the drop wire Wlllbe positioned to arrest the teeler, but when the warp threads are moved vertically, due to the beat-up movement ofthe lay when filling is laid in the shed prior to the beat-up, the laterally extending arm or controller 41 will lift the drop wire from .the path of the teeler movement, and the loom will continue to run. Should, however,

full access to the cloth and the warp threads in front of the lay.

It may be desired in some oasesto provide the filling drop wire with a lifting member for manually lifting the drop wire, and in such case ahand piece 53 (Fig may be provided.

VVhatis claimed is: y

1. In a loom, the combiinition of the lay, a 'leeler for effecting loom stoppage, a series of warp drop w.. i normally supported by the warp thre: is out oi the path of feeler movement, and drop wire norn'ially in the path of the toeler removed from the path or? the teeler by the increased tension exerted upon the warp threads as the lay heats up the filling laid in the shed prior to the beat-up.

2. In a loom, the. combination of the lay, a feeler for stopping the loom. when its movement is arrested, series ot warp drop wires for arresting the teeler when a warp thread breaks or becomes too slaclr, and a drop wire normally position to arrest the from its 'feeler arresting position by the beat-up movement of the lay provided filling; has beenlaid in the shed prior to the beat-up.

3. Ina loom, the combination of the lay, a feeler for stoppingthe loom when its feeling movement arrested, a drop wire normally positioned to arrest the teeler, and means bearin against the warp threads and moved by the warp threads as the lav heats up laid in the shed for removing the'filling drop wire from the path of the teeler.

or looms, the for stopping the combination or a i loom when its a: drop wire normally in position to be V by the 'l'eeler, and means for mo" "op "irc from its fee-lei arresting poion actuetcd by movement of the warp reads the lengthwise tension e1 by the hry it heats up a shed prior to the beat-up. l preyenter for looms, the .L a i'ecler for stopping V *n I eeiingr movement is ar- H a drop wire normally in position to the 'feeler, and r sens .or removing we drop from its ileeler arresting position on each beat-pp movement of the lay until tilting Fails to be laid in the shed that A may arrest the iiieeler and i, in tlnn piece \n'eventcr ,icinent is arrested,

bin} drop win effect loom stoppage only when filling fails to be aid in the shed.

(3. a loom, the combinatioi'i ot the lay tor stopping the loom when its is Z l i g movement is arrested, a series of warp op wires, an extra drop wire adjacent the nrp drop wires and normally positioned. to arrest the feeler, and means bearing against the were threads and moved. thereby the lny be up filling laid in the shed for removing the extra drop wire from tteeler arresting position.

T. In a loom, the combination of the lay, at tl eeler for stopping the loom when its eeling movement is arrested, a series of v drop wires, an extra drop wire scent the warp drop wires and normally positioned to arrest'the 'leeler, and an arm which bears against the warp threads and is actuated :t'or removing the extra drop wire trom its nor- O inal tt'eeler arrestim; position due to movement or" the wsrp tarezzds as the lay heats up when filling hes been laid in the shed prior to the beat-up.

8. in a loom the combination of the lay,

the heddles for shedding the war") threats,

a 't'eelcr located back of the hoddles and arranged to stop the loom when its feeling movement is arrested. a drop wire also lo cated back of the heddles and nornrlly posi- EJO tinned to arrest the iieeler, and an arm which bears upon the warp threails and is operatively related to the said drop wire remove it from the path of the 'leoler when the arm is moved by the wap threads during -35 the beat-up movement of the lay.

9. In. a loom, the combination of a, series of warp drop wires normally supported by the warp threads, a teelcr for stopping the loom when its feeling movement is arrested,

00 an extra dro wire adjacent the series of warp drop wires and normally positioned to arrest movement of the feeler, and a drop wire controller for removing the extra drop wire from its feeler arresting position as the lay beats up the fillin 10. In a loom, the combination of a series of warp drop wires normally supported by the warp threads, :1 teeler for stopping the loom when its feeling movement is arrested, an extra drop wire adjacent the series of warp drop wires and normally positioned to arrest movement of the teeler, and a drop wire controller which bears upon the warp threads and is moved by the increased tension thereof on the beatup for removing the extra drop wire from its iteeler arresting position as the lay beets up the filling.

11. in a loom, the combination of warp drop wires normally supported by the warp threads, :1 feeler for stopping the loom when its feeling movement is arrested, an extra drop wire adjacent the warp drop wires and normally supported in oosition to arrest movement of the feeler, a drop wire controller adjacent the warp drop wires and moved by the warp threads to withdraw the extra drop wire from its teeler arresting p0- sition when filling has been laid in the shed prior to the beat-up.

12. In a thin place preventer for looms, the combination of a teeler having a feeling movement, a drop wire normally in the path of the feeler, and a drop wire controller which rests upon the sheet of warp threads and is actuated. by the sheet of warp threads for removing the drop wire from the path of the teeler when the lay heats up filling laid in the shed.

13. A. thin place preventer for looms, comprising, in combination, a feeler for stopping the loom when its feeling movement is arrested, a drop wire which is normally in position to arrest the teeler, a drop wire controller which bears upon the sheet of the warp threads and is'actua ted by the movement of the sheet of warp threads in a vertical direction as the lay beats up the filling to remove the drop wire from the path of the feelcr when filling has been laid in the shed prior to the beat-up.

14. In a loom, the combination of the lay, a feeler and a series of warp drop Wires located back of the lay, an extra drop wire adjacent the warpdrop wires and normally in position to arrest the feeler, a drop wire controller which rests upon the sheet of warp threads back of the lay and is raised by the sheet of warp threads when the lay beats up filling laid in the shed prior to the beat-up.

15. In a loom, the combination of a warp stop motion comprising warp drop wires and feeder, an extra drop wire adjacent the warp drop wires and normally positioned to arrest the feeler and effect loom stoppage, a drop wire controller connected to the extra drop wire and actuated by the sheet of warp threads as they move vertically on a beat-up movement of the lay when filling has been laid in the shed,

16. In a loom, the combination of the lay,

a Warp stop mechanism including a ieeler and a series o't Warp drop Wires normally supported out oil? the path of the feeier, a drop Wire normally in the path of the feeler, and an arm which is moved by the Warp threads on the beat-up of the lay to remove the drop wire, which is normally in the path of the feeler from feeler arresting position provided filling has been laid in the shed.

17. In a loom, the combination of the lay, a series of Warp drop wires and a ieeler baclr of the lay, an extra drop Wire at one end of the series of. Warp drop Wires and normally positioned for engagement by the feeler, and an arm which bears upon the sheet of Warp threads back of the lay and is moved by the sheet of Warp threads to lift the extra drop Wire from its normal position when the beats up filling previously laid in the shed.

18. In a thin place preventer for looms the combination of the lay, a feeler, a drop Wire normally supported in the path of the feeler in position to effect loom stoppage and arranged to remain in said position When due to the absence of filling from the shed the reed fails to exert a substantial pull upon the Warp as it completes its beat-up stroke, and

' Warp engaging means operable by the tension loom stoppage and arranged to remain in said position when due to the absence of fillint from the shed the reed fails to exert a substantial pull upon the Warp as it completes its beat-up stroke, and Warp engaging, means operable by the tension placed upon the Warp by the reed as the reed beats filling up against the tell of the cloth to move the I drop Wire out of the path of the feeler.

In testimony whereof, I have signed my name to this specification.

ISAAC SNOW. 

